An example app demonstrating Game Center GKMatch GKSendDataReliable packets lost. See StackOverflow question. A workaround for this bug is a RoUTP project.

Steps to reproduce the bug

• Change Bundle ID to yours (registered in iTunes Connect to work with Game Center);
• Use two devices with weak internet connection on one of them (I used Wi-Fi on iPad 3 and EDGE on iPhone 4S);
• Run the app and try to host a match

How typical errors look like

Packet loss

Device stops receiving data while another still sends and receives